unconcern[noun]Synonyms: indifference, aloofness, apathy, detachment, lack of interest, nonchalance
Antonyms: concern
[TahlilGaran] English Synonym Dictionary ▲
un‧con‧cern /ˌʌnkənˈsɜːn $ -ɜːrn/
noun [uncountable] when you do not care about something that other people worry about
unconcern about/for/over
the government’s apparent unconcern about high inflation [TahlilGaran] Dictionary of Contemporary English ▲